結果
| 問題 |
No.160 最短経路のうち辞書順最小
|
| コンテスト | |
| ユーザー |
kei
|
| 提出日時 | 2018-08-27 22:48:56 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
TLE
|
| 実行時間 | - |
| コード長 | 2,846 bytes |
| コンパイル時間 | 2,157 ms |
| コンパイル使用メモリ | 182,932 KB |
| 実行使用メモリ | 8,832 KB |
| 最終ジャッジ日時 | 2024-07-05 18:37:16 |
| 合計ジャッジ時間 | 10,837 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 4 |
| other | AC * 7 TLE * 1 -- * 18 |
ソースコード
#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int INF = 1e9;
const ll LINF = 1e18;
template<class S,class T> ostream& operator << (ostream& out,const pair<S,T>& o){ out << "(" << o.first << "," << o.second << ")"; return out; }
template<class T> ostream& operator << (ostream& out,const vector<T> V){ for(int i = 0; i < V.size(); i++){ out << V[i]; if(i!=V.size()-1) out << " ";} return out; }
template<class T> ostream& operator << (ostream& out,const vector<vector<T> > Mat){ for(int i = 0; i < Mat.size(); i++) { if(i != 0) out << endl; out << Mat[i];} return out; }
template<class S,class T> ostream& operator << (ostream& out,const map<S,T> mp){ out << "{ "; for(auto it = mp.begin(); it != mp.end(); it++){ out << it->first << ":" << it->second; if(mp.size()-1 != distance(mp.begin(),it)) out << ", "; } out << " }"; return out; }
/*
<url:https://yukicoder.me/problems/no/160>
問題文============================================================
=================================================================
解説=============================================================
================================================================
*/
struct edge{
ll u,v,cost;
edge(ll u = 0,ll v = 0,ll cost = 0):u(u),v(v),cost(cost){}
};
vector<ll> rec(ll n,vector<ll>& dist,vector<vector<edge>>& g,ll G,vector<int>& visited){
vector<ll> ret;
visited[n] = true;
if(n == G){
ret.push_back(G);
return ret;
}
for(auto e:g[n]){
if(dist[e.v] == dist[e.u] + e.cost){
ret = rec(e.v,dist,g,G,visited);
if(!ret.empty()){
ret.push_back(n);
return ret;
}
}
}
visited[n] = false;
return ret;
}
vector<ll> solve(){
vector<ll> res;
ll N,M,S,G; cin >> N >> M >> S >> G;
vector<vector<edge>> g(N);
for(int i = 0; i < M;i++){
ll u,v,cost; cin >> u >> v >> cost;
g[u].push_back(edge(u,v,cost));
g[v].push_back(edge(v,u,cost));
}
for(int i = 0; i < N;i++){
sort(g[i].begin(),g[i].end(),[](const edge& e1,const edge& e2){return e1.v < e2.v;});
}
vector<ll> dist(N,INF);
dist[S] = 0;
{
queue<ll> q; q.push(S);
while(q.size()){
ll n = q.front(); q.pop();
for(auto e:g[n]){
if(dist[e.v] > dist[e.u] + e.cost){
dist[e.v] = dist[e.u] + e.cost;
q.push(e.v);
}
}
}
}
//cout << dist << endl;
vector<int> visited(N);
res = rec(S,dist,g,G,visited);
reverse(res.begin(),res.end());
return res;
}
int main(void) {
cin.tie(0); ios_base::sync_with_stdio(false);
cout << solve() << endl;
return 0;
}
kei